Gradients

1
Area of a circle
3.1
28.3
50.3
0
12.6
78.5
when r 2.5
A 20 (to 2sf)
when A 30
r 3.1 (to 2sf)
2
Temperature of a cup of coffee
After 12 minutes
the temperature is 56?C (nearest ?).
The temperature is 70?C
after 6 minutes(nearest minute).
3
Drawing Graphs

• Draw up a table of values using data or values
  calculated from a formula.

• Put the independent variable on the horizontal
  axisand the dependent variable on the vertical
  axis.

• Use suitable scales, covering the range of
  values.Draw a large graph using a sensible
  scale.2 cm representing 1, 2, 5, 10, 20, 50,
  100, 200, 500,

• Plot the points.Draw the best fit curve or
  straight line through them.

• Add title and labels (including units if there
  are any).